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how to set max screen size for mobile first site

Hi,
I have built a website but have noticed that it doesn't show in blackberry's. I understand that one way to overcome this problem is to make my site mobile first.
I understand that blacberry's can't read css @media and that one way around the problem is to make the website mobile first.
How do you set the max screen size to a maximum of 500px with css without using @media? This is the css file as it is now.